Add a query variable

I want to create a query variable with the elasticsearch data source, but as you can see in the picture, when I query to “feed Name” column, it does not show any value as a preview, but when I query to “EDL file Count” column, It displays the values you see in the image. plz help me.

Hi @mikhailvolkov Your guidance always helps me a lot, I hope you will guide me this time as well.